Multiple synchronized pneumatic paper stock control device



Jan. 3, 1956 p vos-r 2,729,147

MULTIPLE SYNCHRONIZED PNEUMATIC PAPER STOCK CONTROL DEVICE Filed Jan.26, 1953 4 Sheets-Sheet 1 f il yfim w B. E. PREVOST MULTIPLESYNCHRONIZED PNEUMATIC PAPER STOCK CONTROL DEVICE Jan. 3, 1956 4Sheets-Sheet -2 Q 2 Z FNVEN TOR.

BY W W 9 //9 Fly.

Filed Jan. 26, 1953 Jan. 3, 1956 B. E. PREVOST 2,729,147

MULTIPLE SYNCHRONIZED PNEUMATIC PAPER STOCK CONTROL DEVICE Filed Jan.26, 1953 4 Sheets-Sheet 5 f, 24 I B f--60 1 E4 4 mmuumu g /O2 g I A A I2/ v" fil Q E 74 N I i W 5 j Jan. 3, 1956 B E. PREVOST 2,729,147

MULTIPLE SYNCHRONIZED PNEUMATIC PAPER STOCK CONTROL DEVICE Filed Jan.26, 1953 4 Sheets-Sheet 4 TIL a) INVENTOR. BY MI. M [444 v M W UnitedStates Patent MULTIPLE SYN CHRONIZED PNEUMATIC :PAPER STOCK CONTROLDEVICE Bruno E. Prevost, West Boxford, Mass., 'assignor to John W.Bolton & Sons Inc., Lawrence, Mass., a corporation of MassachusettsApplication January 26, 1953, Serial No. 333,049

6 Claims. ((21. 92-46) This invention is a stock controlling device formaking more uniform the paper stock in apaper making machine asdelivered from a beater chest and caused to pass through a primaryJordan and from there to an intermediate or machine chest from which itis pumped into a secondary Jordan from which Jordan, the fiowable liquidpaper stock passes to the receiving end of a machine, such as the wellknown head box of a Fourdrinier machine, for converting the paper stockinto a sheet of paper.

It also regulates the pressure in one or moreJordans between the plugand shell so as to make the stock more uniform when it enters theFourdrinier head box and again checks and regulates its consistency asit leaves the Fourdrinier wire and goes on to a suction couch roll withregard to the arrangement and closeness of its fibres and othercharacteristics which increase or decrease its resistance to the liquidbeing sucked out by the vacuum in the couch roll.

I interpose three or more valves or their equivalents in the course ofthe stock from the heater to the couch roll, each of the type operableby an air pressure diaphragm motor of the pneumatic pressure type, eachcontrolled by a substantially similar controller and recorder interposedbetween each valve and a sensitive member responsive to the level of thestock in the machine chest, the pressure between the plug and shell orthe consistency of the stock at the suction couch roll. V 7

By controlling and regulating automatically by over at mospheric airpressure the stock while passing at least the above indicated stationsto conform as nearly as possible to predetermined requirements and bythe use of air pressure which is clean if it leaks into the mill, whilethe motors have few moving parts and require little oiling and whichcannot have short circuits, the resulting paper is greatly improved inuniformity and quality and the device as a whole runs with very littleattention and if certain unusual accidents happen, no serious harm isdone to the mechanism.

A paper making machine equipped with my air pressure diaphragm motors tocontrol the flow and consistency of the stock by automatically movingvalves, and a Jordan plug or plugs, in accordance with the variations inconditions at difierent stages as indicated by suitable sensitivemembers between a stock chest and a couch roll of the vacuum typepreferably through suitable recorders and controllers, operates withoutsudden stops and starts, and produces a sheet which when delivered fromthe couch roll is always more uniform within narrow variations than canbe produced with existing devices either electrically or manuallyoperated and controlled.

This invention is a continuation in part of my application filed April24, 1951, Serial Number 222,650 on Synchronized Stock Control Device,now Patent No.

In the drawings,

Fig. 1 is a diagrammatic side elevational view of a paper making machineof the Fourdrinier type with all of my controls in place.

.Fig. 2 is a diagrammatic elevational viewof a motor and a controllerand recorder such as I prefer to use in my systems B and C.

Fig. 3 is a sectional detail view of my preferred type of sensitivemember for use in my system B.

Fig. 4 is a diagrammatic side elevational view of a Jordan engine, itsmotor and recorder and controller such as I prefer to use in my systemsA2 and A4.

Fig. 5 is a sectional detail view of my sensitive mem ber, motor andconnection to a Jordan engine plug such as I use in systems A2 and A4.

Fig. 6 is a diagrammatic detail view of a direct pipe connection betweena machine chest and a Fourdrinier head box.

For clearness and conciseness, we will indicate the three necessary andone desirable system by the connecting con ductors shown in thediagrammatic drawing Fig. l, and consecutively, as the first or stocklevel system by B; the second or primary plug pressure system A2; thethird or stock flow system by C and the 4th or secondary Jordan plugpressure system by A4.

These connecting conductors tie or bind together a sensitive member suchas are indicated by T1, T2, T3 and T4 with a panel or recorder andcontroller indicated by R1, R2, R3 and R4 and air pressure diaphragmmotors D1, D2, D3 and D4 which respectively control the opening orclosing more or less, valves V1, Jordan J1, valve V3 and Jordan J2.

This control system is shown as applied to the combination of deviceswhich are shown in Fig. l as follows.

N is a beater or dump chest.

I1 is a primary Jordan engine and may be of the cutting or other type.

I2 is a secondary or finishing Jordan.

E is a machine or intermediate chest between them.

H is a head box for the machine chest and the secondary Jordan.

P indicates a pump or machine pit from which is fed K, the head box fromwhich stock is fed to the wire 53 of F, a Fourdrinier machine from apipe50 and through a slice outlet gate 52. On wire 53 it travels to acouch roll such as L.

L is a suction couch roll with a leg 55 at the end of the wire.

M indicates a main or commonair pressure line from which air is fed tothe motors.

D1, D2, D3, D4 of the pneumatic diaphragm type which control themovements of valves or similar devices.

V1, J1, V3, J2 are valves or Jordan plugs interposed in the pipes,machines, chests, wire etc., to 'the'suction couch roll L.

R1, R2, R3, R4indicate panels of the recorders and controllers of theJordan plug pressure control systems A2 and A4, the stock level controlsystem B and the stock flow control system C.

For convenience in tracing them, I have marked the Sensitive members aremarked T1, T2, T3 and T4.

In Fig. 4, S is an automatic air pressure varying mechanism. In Fig. 2,O is aso-calledrelay valve and G is a bellows converter in panels R1 andR3 which cooperates with automatic mechanism S.

In Fig. 4, I is a Bourdon spring which cooperates with automaticmechanism S in panels R2 and R4 and motors D2 or D4, Figs. 1 and 5.

The flow of the stock from the beater chest N to the primary Jordan isregulated by valve V1 which is controlled by the stock level controlsystem 'B through panel R1.

I call this the first stage marked B. As shown, the stock goes fromchest N through pump 41 in pipe 42, through hand shutoff valve 39,automatic valve VI, pipe 43, Jordan I 1, hand valve 44 and automaticvalve V3 in pipe 45 to machine chest B then pump 46 in pipe 47 to thehead box H for the secondary Jordan I2 through pipe 49 to a pump P in amachine pit then through pipe 50 to the head box K for Fourdriniermachine F and from there to a suction couch roll L from which as asheet, it is removed in the well known way.

The pressure between the plug and shell knives in the primary Jordan isregulated by means of the plug pressure control system A2, the plug ofthe primary Jordan indicated by J 1, actually operating like a valve.

This stage I call and mark system A2. The air pressure recorder andcontroller indicated by a panel marked R2 is operated from a sensitivemember T2 described in Figs. 4 and 5.

The flow of the stock from the primary Jordan to the machine chest isregulated by valve V3 which is controlled by the stock flow controlpanel R3 from the couch roll L.

I will call and mark this the third stage and mark it system C. Thethird stage is to regulate the treatment of the stock in Jordan J1, bymeans of the vacuum pressure in leg 55, which is conducted throughconductors C, to controller and recorder R3, wherein the vacuum isconverted to air pressure, which is fed, through conductor C, to airmotor D3, which operates valve V3.

The pressure in secondary Jordan I 2 is regulated in the same way as inJordan J1 by secondary plug pressure system A4.

The fourth stage, system A4, which may or may not be used, is to controlthe pressure in the secondary Jordan I 2 through a recorder andcontroller indicated by a panel R4 and an air pressure operablediaphragm motor marked D4.

In Fig. 2 is shown an air presure diaphragm motor such as D1, D3 and inFig. 5 one such as D2 and D4.

The four air pressure operable diaphragm motors D1, D2, D3 and D4 areall of substantially the same constructions.

Motors D1 and D3 are each formed with a casing 16, an air chamber 14 inwhich is a diaphragm 15 into which chamber on one side of the diaphragm15 the right amount of compressed air is conducted from the appropriaterecorder and controller R1 or R3 by an air conductor, such as 12.

On the other side of the diaphragm 15 is a plate 13 which operates a rod111 which passes through a bearing hole 19 in a partition 18 and isprovided with a stop 119 and a returning spring 117 which tends tocounteract the air pressure in chamber 14.

Rod 111 carries a closure 112 for a valve seat 113 in a valve such as V1between pipe sections 42 and 43 from beater chest N.

As shown in Fig. 5, diaphragm motor D2, as also D4, are substantiallythe same as D1 except that the casing 116 includes a hub 104 for a screwfrom hand wheel 102 and there are two diaphragms 15 and 115 and the airfrom a pipe such as 12 goes between them.

There is also a pressure plate 105 to engage diaphragm 115 and press itagainst 15 and plate 113 to move rod 111 against spring 117 foradjusting or in case there is a leak in the air supply.

Rod 111 moves plug shaft 21 in its thrust bearing together withsensitive member T2 as the pressure between plug 22 and shell 23 varies.

The recorder and controller devices, each of which for convenience wewill call a panel, are all of similar construction such as shown in Fig.1 and as follows.

The mechanism of each recorder and controller R1, R2, R3, R4 is the samein the following particulars.

The main or common air pressure line is M and from this are one or morebranches to a relay valve 0 in a recorder and controller such as R1, R2,R3 or R4. One line, designated as air supply line 24 goes from main airline M to the air relay valve 0 in a recorder and controller. The otherline, designated as air supply line 12 goes to a diaphragm motor such asD1, D2, D3 or D4.

In the air relay valve 0 in a recorder and controller, the air supplydivides. A small part passes through the orifice 73 and feeds a bleednozzle 89 through nozzle air line 71. The main flow of air goes to oneof the diaphragm motors D1, D2, D3 or D4 to control a valve such as V1or V2 or to move axially the thrust bearing 20 for a shaft 21 whichcarries a plug 22 of a Jordan such as J 2 or 14 in its shell 23.

There is a connecting air line 11 shown in Fig. 2 from a sensitivemember T1 or it might be from sensitive member T3 to a bellows convertersuch as G which moves a rod and bell crank lever 86 pivoted at 81 to thebody R of a recorder and controller R1 or R3 which includes automaticmechanism 8 to operate the bleed nozzle 89 for automatically increasingor decreasing the over atmospheric pressure in a diaphragm motor D1 orD3 and for indicating the desired pressure in the machine chest orsuction roll as the case may be.

Arm 86 of bellows converter G is connected to an arm 87 in automaticmechanism S which arm is pivoted at 91 to a rocking bracket 80 mediallypivoted at 92 to the body R of a recorder and controller such as R1 orR3 in such a way that the arm 87 when caused to move by variation inunder atmospheric pressure in a senitive member such as T3 or of anypressure in T1, T2 or T4 will move one arm of bracket 80 on its pivot 92on body R so that it will move a pen arm 84 fixed to it at 92 to showpressure.

The bracket 80 is of the rocker type pivoted at 92 with arm 87 pivotedto one of its arms 91 while its other arm 93 has a lip which extendsunder the end of a bafile plate 88 pivoted at directly above an airrelease regulating or bleed nozzle 89. As shown, there is a revolubleback plate 94 and an arm 83 capable of adjustment thereon or therewith.Baflle plate 88 is mounted in a position to cooperate with the nozzle 89which normally remains fixed after it is adjusted and is supplied withair from a pipe 71 from relay valve 0. The air supplied to the nozzleescapes through it in amounts determined by the position of the bai'lle88 with the result that as the baille approaches the nozzle 89, the backpressure in the pipe 71 will increase and as the baffle moves away fromthe nozzle the back pressure in the pipe 71 will decrease. This pipe 71communicates tthrough a by-pass tube 77 and through an orifice 73 frommain air pressure supply pipe 24 and with the capsular diaphragm 75 ofthe relay valve 0.

As the back pressure increases in the pipe 71, the capsular diaphragm 75will move its valve element 74 to decrease the amount of compressed airfrom the supply pipe 24 and its over atmospheric air pressure branchpipe 12 leading to the air chamber 14 of a diaphragm motor D1, D2, D3 orD4.

The decrease in the above mentioned back pressure in the pipe 71 willaffect the capsular diaphragm 75 to move the valve element 74 toincrease the application of compressed air to the air chamber 14 at thetop of valve assembly V1 through pressure pipe 12, thus pushing againstdiaphragm 15, plate 13 and spring 117 to move rod 111 to tend to closevalve closure 112 on valve seat 113 in valve V1 in outlet 42, V3 inoutlet 45 or the plug of Jordan J1 or Jordan J2.

The sensitive member for the first stage B is T1 and the weight andlevel of the stock in machine chest E is transmitted through pipes B, Band recorder and controller R1 to diaphragm motor D1.

The sensitive member for the third stage is T3 and is the vacuum leg 55for the suction couch roll L and its subatmospheric pressure istransmitted through pipes C, C, recorder and controller R3 to diaphragmvalve motor D3. In recorder R3, the subatmospheric pressure is connectedis to over atmospheric pressurefrom themain air supply line M whichalways carries such pressure.

The sensitive member for the second stage is T2 and pressure in JordanJ1 is transmitted to diaphragmmotor D2 through conductors A1, A1,recorder and controller R2 to diaphragm motor D2 which moves the thrustbearing such as 26 with its Jordan plug shaft such as 21 and plug suchas 22 in a Jordan such as J1 in its shell such as 23 according to thepressure between its plug and shell. In Fig. 4, '79 is the radialbearing'of the Jordan.

If a second or other Jordan such as J2 is to be regulated for the fourthstage, its sensitive member such as T4 through conductors A4, A4,recorder and controllerR4 and diaphragm motor D4 moves the plug bearing,shaft and plug of Jordan J2 in the same manner as J1 according to thepressure between its plug and shell.

The sensitive member T1 for the stock level system B (see Fig. 3)includes a pipe 60 attached by brackets 35, 35 to an inside wall 34 ofthe machine chest'E in such a way that its bottom which is provided witha flange 37 is spaced perhaps 12 inches from the bottom of-the chest.This pipe 60 serves as an escape hatch for the air bleed nozzle 64 whichhas a vent 65 inside of pipe 60 and also houses the air supply line 24from main air supply line M and the air line 11 to the bellowscontroller G of the panel R1.

At the bottom of pipe 60 is a sensing'unit 139 in which are suitablethreaded and other passages for the various devices and this is held inplace by a flan'ge38 in which is an opening 61 so that a diaphragm 62,preferably of stainless steel, can be clamped between flange 38 and unit139.

In contact with the diaphragm 62 and engaging a bafile 63 is a contactbutton 67. This baffle 63 is pivoted at 53 between a spring 66 and thecontact button'67 so that its free end will be able to move backandforth between the opening of the bleed nozzle 64 and the diaphragm62.

The weight of the liquid in the machine chest E up against the diaphragm62 must be balanced by an equal pressure of air exerted against the topor inside'or sensing side of the diaphragm 62.

This balancing pressure is fed to the sensing unit from the recorder andcontroller R1 by way of the air supply line 24, whereby a rising stocklevel in the chest B will increase the pressure exerted by thestock-againstthe diaphragm. Such a temporaryunbalancing would cause thediaphragm to move towards thesensing unitand towards the inlet of thebleed nozzle 64. Such a'temporary unbalancing would cause the diaphragm62 to move towards the sensing unit 39, thereby moving the baffle 63closer to the air bleed nozzle 64. This restricts the flow of air to theatmosphere, through pipe 60, and causes an increase in back pressurethrough air line 11 to the bellows converter G in the recorder andcontroller R1.

This increase in back pressure then tends to close the air pressurediaphragm valve D1 in system B, thus reducing the amount of stock whichis permitted to flow through it.

Therefore, as the level of the stock rises in the machine chest E, theback pressure, through air line 11 to bellows converter G, in thecontroller, is increased thereby reducing the back pressure through thenozzle air line 71 which lowers the ball 74 in the relay valve andincreases the amount of air flowing through air line 12 to valve B1.This increased pressure in the valve B1 tends to close it reducing theamount of stock which is permitted to flow through it.

Where a secondary Jordan I 2 is used as shown in Fig. 1, I prefer tohave the flow pipe 47 from machine chest E enter a compartment 90 in aJordan head box H so that part of the stock passes through a gate 91into compartment 92 and through pipe 48 into Jordan I2 while the levelis maintained by a baffle 93 over which any excess goes into compartment94 and back through pipe 95 into machine chest B.

As shown in Fig. 6 the second Jordan J2 and system A4 with its membersR4, D4, H and T4 can be omitted 16 and flow pipe 47 from pump 46canco'nnect directly with Fourdrinier head box K through pipe 50.

The Fourdrinier head box K may be like H, but, as shown it is in onecompartment 51 and it has the usual adjustable slice outlet gate 52,with wire 53, and suction boxes 54, 54.

The sensitive members T2 and T4 used in systems A2 and A4, Fig. 1, areboth the same as shown in Fig. 5 in section as applied to a Jordan plugand Fig. 4 shows the connection as from T2 to a recorder and controllerR2 in which there is a relay valve 0 and automatic mechanism S, butbellows converter G is replaced by a Bourdon spring I.

A sensitive member T2 or T4 is located between bearing 20 and rod 111and is a sealed disk of mercury 27 connected by tube 11 to a Bourdonspring I in recorders and controllers R2 and R4. The tube of spring Icarries an arm 86 connected to arm 87 of automatic mechanism S. Thismechanism S and relay valve 0 are the same in all of the recorders andcontrollers R1, R2, R3, R4 for operating the pneumatic diaphragm motorsD1, D2, D3 and D4 in systems B, A2, C and A4.

Valves 39, 44 and 96 are to manually regulate the stock flow if thediaphragm motors D1 or D3 or the flow needs special adjustment.

It will be apparent that the inlet valve V1 for the Jordan will cut downthe amount of stock delivered to the Jordan J1 if the liquid levelsensitive device T1 indicates that the liquid level in machine chest Eis too high. Similarly outlet valve V3 will cut down the amount of stockexiting from the Jordan I 1, and thereby retain the stock in the Jordanfor further refining, if the suction sensitive device T3 so indicates.In either case the pressure sensitive device T2 and the pneumatic motorD2 will automatically compensate for any changes in stock pressure inthe Jordan 11 caused by the operation of the valve V1 or V3 and maintainthe pressure of the plug against the shell lining at a constant amount.The degree of refinement of the stock thus remains even in spite ofrestrictions in the outlet or inlet of the Jordan and turbulence oroscillatory surges within the Jordan are avoided.

In operation, as long as the proportion of water and fibres remainsconstant, a uniform layer of fibres will be deposited on the Fourdrinierwire and the suction at the couch roll will remain uniform. Unlike priorcontrol devices wherein the Jordan plug is controlled bya reversibleelectric motor through an unyieldable thrust screw or the like, in thisinvention, the Jordan plug'is controlled by an air operated motorcontinually urging the plug inward at a uniform pressure but yieldableoutwardly under excessive stress. Thus while the stock consistency iscorrect and the suction uniform, the plug is continually urged inwardlyat a uniform pressure to automatically take up the wear of the knives.Similarly the stock level control system continually compensates forchanges in stock level in the machine chest to keep the system always inbalance and to keep a uniform flow of stock to the Fourdrinier.

If the consistency of the stock changes in the proportion of fibre towater, the air and water passage through the paper sheet on theFourdriner wire will be affected and the suction will changecorrespondingly. It-has heretofore been proposed to use the abovementioned reversible electric motor to axially slide the Jordan plug inrected by maintaining the stock in the Jordan for a longer or shortertime. Thus the consistency of the stock is maintained uniform by flowcontrol rather than by knife clearance control as in other well knowndevices. By opening and closing the outlet valve of the Jordan inaccordance with changes in suction the stock in the Jordan is refinedmore or less as required and undue axial movements of the plug isavoided.

When the rate of flow and time of refining in the lordan is changed byactuating the outlet valve, it will be apparent that the stock levels inthe head box and chests will change correspondingly. Stock level changescan of course be disastrous and, in operation, the machine chest absorbssuch changes sufiiciently to prevent such disasters. When the Jordanoutlet valve is opened or closed by changes in suction, the machinechest will receive more or less of the stock but the level in theFourdrinier head box remains constant in view of the ability of thechest to absorb ordinary stock level changes. However, if the level inthe machine chest changes beyond predetermined limits, the levelsensitive device actuates the Jordan inlet valve to change the of stockto the Jordan in an amount to maintain balance.

When a primary or cutting Iordan is used in tandem with a secondary orbrushing Jordan as illustrated in Fig. l, the Jordan pressure in both.Tordans remains uniform at all times. Corrections for changes inconsistency are accomplished automaticaly by opening and closing theoutlet valve of the primary Jordan to increase or decrease thecoarseness of the fibres in the stock as they are being cut or shearedby increasing or decreasing the time of refining and hydration in thatJordan. Constant maintenance of uniform pressure between the Jordan plugand shell knives is thus achieved by this invention and the fibrestructure remains uniform rather than being changed to compensate forsuction changes. Control of the rate of speed at which stock ispermitted to flow through a Jordan havin" uniform pressure and clearanceresults in a maintenance of the exact fibre structure required and doesnot involve continual changes of conditions within the Jordan.

l claim:

1. Paper stock control aparatus for regulating paper stock in a systemwhich includes a heater chest and pump, a Jordan inlet valve, a Jordan,a Jordan outlet valve, a machine chest and pump, a ..achine head box, aFourdrinier machine and a couch roll suction leg, said control apparatuscomprising first pneumatic means automatically advancing and retractingthe Jordan plug in accordance with variations in stock pressure withinthe Jordan for continuously maintaining uniform preselected pressurebetween the plug and shell knives thereof; second pneumatic meansautomatically opening and closing the Jordan outlet valve in accordancewith variations in the quantity and equality of the stool: at the couchroll for increasing and decreasing the time stoclt remains in saidJordan and third pneumatic means au omatically opening and closing theJordan inlet valve in accordance with variations in the stock level ofthe machine chest for increasing and decreasing the amount of stockdelivered to said Jordan, said first means automatically compensatingfor changes in stock pressure in the Jordan caused by the actuation ofsaid second and third means.

2. A combination as specified in claim 1 wherein said third pneumaticmeans comprises a liquid level sensitive device submerged in saidmachine chest, a source of air pressure, a pneumatic converter forconverting pressure variations in said sensitive device into variationsin air pressure, an axial air pressure motor operably mounted on saidJordan inlet valve and an air pressure pipe lead ing from said converterto said motor.

3. Paper stock control apparatus for regulating paper stock in a systemwhich includes a beater chest and pump, a Jordan inlet valve, and amachine chest for a Fourdrinier comprising an axial air pressure motoroperably mounted on the Jordan inlet valve for regulating the quantityof paper stock delivered by said beater chest to said Jordan, a sourceof air pressure for operating said axial air pressure motor; a liquidlevel sensitive device submerged in said machine chest for sensingvariations in paper stock level therein and a pneumatic converterbetween said sensitive device and said axial air pressure motor forconverting variations in liquid level, sensed by said sensitive device,into variations in air pressure delivered from said air source to saidaxial air pressure motor.

4. Paper stock control apparatus for regulating the tlow of paper stockin a system which includes a Jordan inlet valve, a Jordan, a Jordanoutlet valve, a machine chest and pump, and a Fourdrinier having a couchroll suction leg, said apparatus comprising an axial air pressure motorfor opening and closing said Jordan inlet valve, another axial airpressure motor for opening and closing said Jordan outlet valve;pneumatic converter means for converting variations in suction in saidsuction leg into variations in air pressure for actuating the axial airpressure motor of said Jordan outlet valve, a liquid level sensitivedevice submerged in said machine chest and another pneumatic convertermeans for converting variations in liquid livel, sensed by saidsensitive device, into variations in air pressure for actuating theaxial air pressure motor of said Jordan inlet valve whereby changes inlevel in said chest caused by actuating the Jordan outlet valve areautomatically compensated by changes in fiow through said Jordan inletvalve.

5. In paper making apparatus including a Fourdrinier supplied with paperstock by a Jordan, the combination of pneumatically operated Jordanoutlet valve means, actuated by variations in suction in theFourdrinier, for correspondingly varying the flow of stock exiting fromthe Jordan, pneumatically operated Jordan inlet valve means, actuated byvariations in liquid level of the machine chest of the Fourdrinier forcorrespondingly varying the flow of stock entering the Jordan andpneumatically operated Jordan plug advancing and retracting means,actuated by variations in the pressure between the plug and shell liningof the Jordan, for maintaining said pressure at a predetermined constantamount despite the fluctuations in flow caused by operation of saidvalves.

6. Paper stock control apparatus for regulating paper stock in a systemwhich includes a Jordan having an inlet valve and an outlet valve and aFourdrinier having a suction compartment, said apparatus comprisingfirst air diaphragm operated means for elfecting axial adjustment of theJordan plug within the Jordan shell; pressure sensitive means responsiveto pressure changes between said plug and shell for actuating said firstair operated means to maintain said pressure at a predetermined constantamount; second air operated means for effecting adjustment of the Jordanoutlet valve; suction sensitive means responsive to suction changes insaid suction compartment for actuating said second air operated means toretard or advance the flow of stock through said Jordan by means of saidoutlet valve; third air operated means for effecting adjustment of theJordan inlet valve and liquid quantity sensitive means in said systembetween said Jordan and said Fourdrinier for actuating said third airoperated means to increase and decrease the quantity of stock admittedto said Jordan in accordance with changes in flow time therethrough.

References Cited in the file of this patent UNITED STATES PATENTS1,773,832 Ware Aug. 26, 1930 1,933,814 Lewellen et al. Nov. 7, 19331,945,788 Witham Feb. 6, 1934 2,024,424 Bryson Dec. 17, 1935 2,627,788Staege Feb. 10, 1953 2,642,781 Croake et al. June 23, 1953 2,666,368Staege et al. Jan. 19, 1954

